drivers/gpu/drm/cirrus/cirrus_fbdev.c

   1 /*
   2  * Copyright 2012 Red Hat
   3  *
   4  * This file is subject to the terms and conditions of the GNU General
   5  * Public License version 2. See the file COPYING in the main
   6  * directory of this archive for more details.
   7  *
   8  * Authors: Matthew Garrett
   9  *          Dave Airlie
  10  */
  11 #include <linux/module.h>
  12 #include <drm/drmP.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include <drm/drm_crtc_helper.h>
  15
  16 #include "cirrus_drv.h"
  17
  18 static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
  19                              int x, int y, int width, int height)
  20 {
  21         int i;
  22         struct drm_gem_object *obj;
  23         struct cirrus_bo *bo;
  24         int src_offset, dst_offset;
  25         int bpp = afbdev->gfb->format->cpp[0];
  26         int ret = -EBUSY;
  27         bool unmap = false;
  28         bool store_for_later = false;
  29         int x2, y2;
  30         unsigned long flags;
  31
  32         obj = afbdev->gfb->obj[0];
  33         bo = gem_to_cirrus_bo(obj);
  34
  35         /*
  36          * try and reserve the BO, if we fail with busy
  37          * then the BO is being moved and we should
  38          * store up the damage until later.
  39          */
  40         if (drm_can_sleep())
  41                 ret = cirrus_bo_reserve(bo, true);
  42         if (ret) {
  43                 if (ret != -EBUSY)
  44                         return;
  45                 store_for_later = true;
  46         }
  47
  48         x2 = x + width - 1;
  49         y2 = y + height - 1;
  50         spin_lock_irqsave(&afbdev->dirty_lock, flags);
  51
  52         if (afbdev->y1 < y)
  53                 y = afbdev->y1;
  54         if (afbdev->y2 > y2)
  55                 y2 = afbdev->y2;
  56         if (afbdev->x1 < x)
  57                 x = afbdev->x1;
  58         if (afbdev->x2 > x2)
  59                 x2 = afbdev->x2;
  60
  61         if (store_for_later) {
  62                 afbdev->x1 = x;
  63                 afbdev->x2 = x2;
  64                 afbdev->y1 = y;
  65                 afbdev->y2 = y2;
  66                 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  67                 return;
  68         }
  69
  70         afbdev->x1 = afbdev->y1 = INT_MAX;
  71         afbdev->x2 = afbdev->y2 = 0;
  72         spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  73
  74         if (!bo->kmap.virtual) {
  75                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  76                 if (ret) {
  77                         DRM_ERROR("failed to kmap fb updates\n");
  78                         cirrus_bo_unreserve(bo);
  79                         return;
  80                 }
  81                 unmap = true;
  82         }
  83         for (i = y; i < y + height; i++) {
  84                 /* assume equal stride for now */
  85                 src_offset = dst_offset = i * afbdev->gfb->pitches[0] + (x * bpp);
  86                 memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
  87
  88         }
  89         if (unmap)
  90                 ttm_bo_kunmap(&bo->kmap);
  91
  92         cirrus_bo_unreserve(bo);
  93 }
  94
  95 static void cirrus_fillrect(struct fb_info *info,
  96                          const struct fb_fillrect *rect)
  97 {
  98         struct cirrus_fbdev *afbdev = info->par;
  99         drm_fb_helper_sys_fillrect(info, rect);
 100         cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 101                          rect->height);
 102 }
 103
 104 static void cirrus_copyarea(struct fb_info *info,
 105                          const struct fb_copyarea *area)
 106 {
 107         struct cirrus_fbdev *afbdev = info->par;
 108         drm_fb_helper_sys_copyarea(info, area);
 109         cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
 110                          area->height);
 111 }
 112
 113 static void cirrus_imageblit(struct fb_info *info,
 114                           const struct fb_image *image)
 115 {
 116         struct cirrus_fbdev *afbdev = info->par;
 117         drm_fb_helper_sys_imageblit(info, image);
 118         cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
 119                          image->height);
 120 }
 121
 122
 123 static struct fb_ops cirrusfb_ops = {
 124         .owner = THIS_MODULE,
 125         .fb_check_var = drm_fb_helper_check_var,
 126         .fb_set_par = drm_fb_helper_set_par,
 127         .fb_fillrect = cirrus_fillrect,
 128         .fb_copyarea = cirrus_copyarea,
 129         .fb_imageblit = cirrus_imageblit,
 130         .fb_pan_display = drm_fb_helper_pan_display,
 131         .fb_blank = drm_fb_helper_blank,
 132         .fb_setcmap = drm_fb_helper_setcmap,
 133 };
 134
 135 static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
 136                                const struct drm_mode_fb_cmd2 *mode_cmd,
 137                                struct drm_gem_object **gobj_p)
 138 {
 139         struct drm_device *dev = afbdev->helper.dev;
 140         struct cirrus_device *cdev = dev->dev_private;
 141         u32 bpp;
 142         u32 size;
 143         struct drm_gem_object *gobj;
 144         int ret = 0;
 145
 146         bpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0) * 8;
 147
 148         if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
 149                                       bpp, mode_cmd->pitches[0]))
 150                 return -EINVAL;
 151
 152         size = mode_cmd->pitches[0] * mode_cmd->height;
 153         ret = cirrus_gem_create(dev, size, true, &gobj);
 154         if (ret)
 155                 return ret;
 156
 157         *gobj_p = gobj;
 158         return ret;
 159 }
 160
 161 static int cirrusfb_create(struct drm_fb_helper *helper,
 162                            struct drm_fb_helper_surface_size *sizes)
 163 {
 164         struct cirrus_fbdev *gfbdev =
 165                 container_of(helper, struct cirrus_fbdev, helper);
 166         struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
 167         struct fb_info *info;
 168         struct drm_framebuffer *fb;
 169         struct drm_mode_fb_cmd2 mode_cmd;
 170         void *sysram;
 171         struct drm_gem_object *gobj = NULL;
 172         struct cirrus_bo *bo = NULL;
 173         int size, ret;
 174
 175         mode_cmd.width = sizes->surface_width;
 176         mode_cmd.height = sizes->surface_height;
 177         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 178         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 179                                                           sizes->surface_depth);
 180         size = mode_cmd.pitches[0] * mode_cmd.height;
 181
 182         ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
 183         if (ret) {
 184                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 185                 return ret;
 186         }
 187
 188         bo = gem_to_cirrus_bo(gobj);
 189
 190         sysram = vmalloc(size);
 191         if (!sysram)
 192                 return -ENOMEM;
 193
 194         info = drm_fb_helper_alloc_fbi(helper);
 195         if (IS_ERR(info)) {
 196                 ret = PTR_ERR(info);
 197                 goto err_vfree;
 198         }
 199
 200         info->par = gfbdev;
 201
 202         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 203         if (!fb) {
 204                 ret = -ENOMEM;
 205                 goto err_drm_gem_object_put_unlocked;
 206         }
 207
 208         ret = cirrus_framebuffer_init(cdev->dev, fb, &mode_cmd, gobj);
 209         if (ret)
 210                 goto err_kfree;
 211
 212         gfbdev->sysram = sysram;
 213         gfbdev->size = size;
 214         gfbdev->gfb = fb;
 215
 216         /* setup helper */
 217         gfbdev->helper.fb = fb;
 218
 219         strcpy(info->fix.id, "cirrusdrmfb");
 220
 221         info->fbops = &cirrusfb_ops;
 222
 223         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 224         drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
 225                                sizes->fb_height);
 226
 227         /* setup aperture base/size for vesafb takeover */
 228         info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
 229         info->apertures->ranges[0].size = cdev->mc.vram_size;
 230
 231         info->fix.smem_start = cdev->dev->mode_config.fb_base;
 232         info->fix.smem_len = cdev->mc.vram_size;
 233
 234         info->screen_base = sysram;
 235         info->screen_size = size;
 236
 237         info->fix.mmio_start = 0;
 238         info->fix.mmio_len = 0;
 239
 240         DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
 241         DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
 242         DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
 243         DRM_INFO("fb depth is %d\n", fb->format->depth);
 244         DRM_INFO("   pitch is %d\n", fb->pitches[0]);
 245
 246         return 0;
 247
 248 err_kfree:
 249         kfree(fb);
 250 err_drm_gem_object_put_unlocked:
 251         drm_gem_object_put_unlocked(gobj);
 252 err_vfree:
 253         vfree(sysram);
 254         return ret;
 255 }
 256
 257 static int cirrus_fbdev_destroy(struct drm_device *dev,
 258                                 struct cirrus_fbdev *gfbdev)
 259 {
 260         struct drm_framebuffer *gfb = gfbdev->gfb;
 261
 262         drm_fb_helper_unregister_fbi(&gfbdev->helper);
 263
 264         vfree(gfbdev->sysram);
 265         drm_fb_helper_fini(&gfbdev->helper);
 266         if (gfb)
 267                 drm_framebuffer_put(gfb);
 268
 269         return 0;
 270 }
 271
 272 static const struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
 273         .fb_probe = cirrusfb_create,
 274 };
 275
 276 int cirrus_fbdev_init(struct cirrus_device *cdev)
 277 {
 278         struct cirrus_fbdev *gfbdev;
 279         int ret;
 280         int bpp_sel = 24;
 281
 282         /*bpp_sel = 8;*/
 283         gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
 284         if (!gfbdev)
 285                 return -ENOMEM;
 286
 287         cdev->mode_info.gfbdev = gfbdev;
 288         spin_lock_init(&gfbdev->dirty_lock);
 289
 290         drm_fb_helper_prepare(cdev->dev, &gfbdev->helper,
 291                               &cirrus_fb_helper_funcs);
 292
 293         ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
 294                                  CIRRUSFB_CONN_LIMIT);
 295         if (ret)
 296                 return ret;
 297
 298         ret = drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
 299         if (ret)
 300                 return ret;
 301
 302         /* disable all the possible outputs/crtcs before entering KMS mode */
 303         drm_helper_disable_unused_functions(cdev->dev);
 304
 305         return drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
 306 }
 307
 308 void cirrus_fbdev_fini(struct cirrus_device *cdev)
 309 {
 310         if (!cdev->mode_info.gfbdev)
 311                 return;
 312
 313         cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
 314         kfree(cdev->mode_info.gfbdev);
 315         cdev->mode_info.gfbdev = NULL;
 316 }